Wall mounting

We're wanting to wall mount some of the SPA 30x and 5xx phones. There are the classic dual mounting holes for a mounting plate, but all of the plates that I have found in various hardware stores have the RJ11/45 jack slightly raised. While I don't care if I use the builting jack or I run a sperate CAT5 line, I do need someway of conviently mounting the phone. The problem is that back of the phones between the mounting holes is flush and do not permit this raised RJ11/45 jack.

Other than drilling two screws manually into the drywall and mounting the phones, what have others done?

It would be nice on a future phone redeisgn to provide a recess in the back of the phone to accept the RJ11/45 jack sticking up.